[GHC] #15526: Explain or remove mystery import in Unsafe.Coerce

[GHC]

#15526: Explain or remove mystery import in Unsafe.Coerce
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Core Libraries    |              Version:  8.4.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5092
       Wiki Page:                    |
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Comment (by Krzysztof Gogolewski <krz.gogolewski@…>):

 In [changeset:"a811d938acb09b23b11173842143a0fa946bf5cc/ghc" a811d93/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a811d938acb09b23b11173842143a0fa946bf5cc"
 base: Add references to Notes for certain special imports

 Summary:
 Modules like GHC.Integer, GHC.Natural etc. are special and sometimes
 have to be imported just to resolve build ordering issues. It's useful
 to refer to the appropriate Notes at such import sites.

 Test Plan: Read it.

 Reviewers: RyanGlScott, bgamari, hvr, simonpj

 Reviewed By: RyanGlScott, simonpj

 Subscribers: simonpj, rwbarton, carter

 GHC Trac Issues: #15526

 Differential Revision: https://phabricator.haskell.org/D5092
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15526#comment:7>
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